U0 Main()
{
  F64 é=0,è=0,ê=0;
  CD3I32 poly[4];
  CDC *dc=DCAlias;
  DCAllocDepthBuf(dc);
  dc->flags|=DCF_TRANSFORMATION|DCF_SYMMETRY;
  try {
    while (!ScanChar) {
      DCDepthBufRst(dc);
      GrSetSymmetry(dc,Fs->win_pixel_width/2,Fs->win_pixel_height/2,
	ipx-Fs->win_pixel_left-Fs->win_scroll_x,
	ipy-Fs->win_pixel_top-Fs->win_scroll_y);
      dc->color=LTBLUE;
      GrLine(dc,Fs->win_pixel_width/2,Fs->win_pixel_height/2,
	ipx-Fs->win_pixel_left-Fs->win_scroll_x,
	ipy-Fs->win_pixel_top-Fs->win_scroll_y);
 
      GrIdentEqu(dc->r);
      GrRotXEqu(dc->r,ê);
      GrRotYEqu(dc->r,è);
      GrRotZEqu(dc->r,é);
      GrSetRotMat(dc,dc->r);

      dc->x=Fs->win_pixel_width/2;
      dc->y=Fs->win_pixel_height/2;
      dc->z=500;
 
      dc->color=GREEN;
      poly[0].x=50;
      poly[0].y=150;
      poly[0].z=0;
      poly[1].x=275;
      poly[1].y=100;
      poly[1].z=0;
      poly[2].x=155;
      poly[2].y=200;
      poly[2].z=0;
      poly[3].x=100;
      poly[3].y=200;
      poly[3].z=0;
      GrFillPoly3(dc,4,poly);

      dc->color=RED;
      poly[0].x=50;
      poly[0].y=150;
      poly[0].z=50;
      poly[1].x=275;
      poly[1].y=100;
      poly[1].z=50;
      poly[2].x=155;
      poly[2].y=200;
      poly[2].z=50;
      poly[3].x=100;
      poly[3].y=200;
      poly[3].z=50;
      GrFillPoly3(dc,4,poly);

      dc->color=BLUE;
      poly[0].x=50;
      poly[0].y=150;
      poly[0].z=-50;
      poly[1].x=275;
      poly[1].y=100;
      poly[1].z=-50;
      poly[2].x=155;
      poly[2].y=200;
      poly[2].z=-50;
      poly[3].x=100;
      poly[3].y=200;
      poly[3].z=-50;
      GrFillPoly3(dc,4,poly);

      dc->color=RED+GREEN<<16+ROPF_DITHER;
      poly[0].x=50;
      poly[0].y=150;
      poly[0].z=50;
      poly[1].x=275;
      poly[1].y=100;
      poly[1].z=50;
      poly[2].x=275;
      poly[2].y=100;
      poly[2].z=0;
      poly[3].x=50;
      poly[3].y=150;
      poly[3].z=0;
      GrFillPoly3(dc,4,poly);

      dc->color=BLUE+GREEN<<16+ROPF_DITHER;
      poly[0].x=100;
      poly[0].y=200;
      poly[0].z=-50;
      poly[1].x=155;
      poly[1].y=200;
      poly[1].z=-50;
      poly[2].x=155;
      poly[2].y=200;
      poly[2].z=0;
      poly[3].x=100;
      poly[3].y=200;
      poly[3].z=0;
      GrFillPoly3(dc,4,poly);

      WinMgrSync;
      DCFill;
      é+=2.1*ã/180.0;
      è+=1.1*ã/180.0;
      ê+=0.5*ã/180.0;
    }
  } catch
    CatchAll;

  DCFill;
  DCDel(dc);
}

Main;